linux commands

Hi guys,
I got a question about Linux commands.
I totally forgot them all :S
I started ./mohaa_lnxded +exec server.cfg but now i dont know anymore how
to log out properly.
I had to type screen first and then start the server and then i could log
out easily with some keycombo, but that last part i forgot L
Can somebody help ?
Thanks in advance,
A bad memory Sander
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